Chemistry

HELP ME PLEASE 40 POINTS You may select a topic from the list below, or choose your own.black holeoort cloudstar types (supergiant, red dwarf, white dwarf)supernovaeplanetary nebulaeAndromeda galaxyquasarUse the library and other resource materials to research and understand your topic. Remember that nasa.gov is a web site that has reliable information as well that you may use for your research. Now write a 300-word report on what you have learned in the essay box below.
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Use the graph to determine which is greater, the heat of fusion or the heat of vaporization. Explain how you used the graph to determine that.(The substance is water)
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Polyatomic ion formula for aluminum hydroxide
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Chloroform is a commonly used anesthetic with a density of 1.483 g/mL. Determine the volume of chloroform needed to deliver a 9.37 g sample of the anesthetic
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What is the overall reduction potential for the reaction Agt (aq) + Cu(s)>Ag(s) + Cu2+ (aq)?-0.46 V+0.46 V+0.57 v+1.14V
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What is the % of each element in Ni3{PO4) 2 ?
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What is the compounds of AICI3 and H+
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If a woman is pushing a cart 125 N forward and gravity is pushing 50 N backwards on the cart and a child is pushing 25 N backwards on the cart what is the net force?
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How many grams of H2 can be produced from the reaction of 11.50 g of sodium with an excess of water? The equation for the reaction is 2 Na + 2 H2O -> 2 NaOH + H2 Ans: 0.504 2 g H2 I would like to know how to solve this problem, the teacher gave me the answer but I am unsure how to solve it thanks!
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What mass of water will be collected if 20.0 grams of hydrogen are consumed 2H2+O2--->2H2O 358g179g44.7gOr 89.4g
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rank the following in order of the packing of particles (density) from greatest to least:solid liquid gas
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what is the reason that dogs shed does the temperature of water affect the time it takes a sugar cube to dissolve
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What causes a molecule to have a net dipole moment?A. The presence of only nonpolar bonds in the moleculeB. The presence of Van der Waals forcesC. The presence of a net charge that does not cancel outD. The presence of both covalent and ionic bonds in the molecule
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Propane, the gas used in barbeque grills, is made ofcarbon and hydrogen. Will the atoms that make uppropane form covalent bonds? Why or why not?
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Which options identify what the arrows in the diagramrepresent? Check all that apply.D atomselementsenergygasparticles
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Which of these is true concerning an endothermic reaction? *When a system absorbs more energy than it releases and has a negative AH.When a system absorbs more energy than it releases and has a positive AH.When a system releases more energy than it absorbs and has a negative AH.When a system releases more energy than it absorbs and has a positive AH.
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What is the molality of a solution that contains 31.0 g HCl in 5.00 kg water? (molar mass ofHCI = 36.46 g/mol)
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5) Usted empuja muy fuerte un escritorio pesado e intenta moverlo. Usted efecta trabajo sobre el escritorio: a.- Ya sea que lo mueva o no, siempre y cuando usted ejerza una fuerza. B.- Slo si el escritorio se mueve. C.- Slo si el escritorio no se mueve. D.- Nunca; el escritorio hace trabajo sobre usted. E.- Ninguna de las anteriores. ME AYUDAN PORFA?
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Many grasses and few trees characterize ____________ (tundras/temperate grasslands).
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If a strong base, like NaOH, is added to a strong acid, like HCl, the pH of the resultant solution will _________. A.) Go up B.) Go down C.) Stay the same
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I need an answer ASAP!!
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Which metal is most easily oxidized?A) Cu B) Ag C) Mg D) Co
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What improvements have been made in modern farming? Select all that apply.1. machines can do more work over less time2. better seeds sprout and grow much more quickly3. trains can transport food over long distances faster4. trains can transport the machines to rural farms once built5. insecticides used to keep insects off the crops
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Write the beta decay equation for the following isotope: 91 38 Sr? Please write out steps
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